PHP DomDocument无法处理utf-8字符(☆)

网络服务器使用utf-8编码提供响应,所有文件都使用utf-8编码保存,我所知道的设置都已设置为utf-8编码.

这是一个快速程序,用于测试输出是否有效:

<?php
$html = <<<HTML
<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <title>Test!</title>
</head>
<body>
    <h1>? Hello ? World ?</h1>
</body>
</html>
HTML;

$dom = new DomDocument("1.0", "utf-8");
$dom->loadHTML($html);

header("Content-Type: text/html; charset=utf-8");
echo($dom->saveHTML());

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该计划的输出是:

<!DOCTYPE html>
<html><head><meta charset="utf-8"><title>Test!</title></head><body>
    <h1>&acirc;&#152;&#134; Hello &acirc;&#152;&#134; World &acirc;&#152;&#134;</h1>
</body></html>

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其呈现为: